oadbury



(ModeL) 2 SheetsSheet 1.

J. GADBURY 81,- J. G. ROLLASON.

ALARM LOGK.

No. 394,831. Patented Dec. 18, 1888.

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FIG 3.

WI'I'NESSIZ'S/ INV EN OjRS (ModeL) 2 Sheets-Sheet 2. J. OADIBURY & J. G. BOLLASON.

ALARM LOOK.

Pafiented Dec. 18,

FIG 5- FIG 5- mi; N. A/ w WITNESSES N. PUERS. Phnla-lilllogrnpher. Washington. D. c.

UNITED I STATES PATENT OFFICE.

JOEL OADBURY AND JOSEPH GEORGE ROLLASON, OF BIRMINGHAM,

' ENGLAND.

ALARM-LOCK.

SPECIFICATION forming part of Letters Patent No. 394,831, dated December 18, 1888.

Application filed August 13, 1887. Serial N0.246,825. (ModeL) Patented in England May 27, 1886, No.

To all whom it may concern.-

Be it known that we, JOEL CADBURY and JOSEPH GEORGE ROLLASON, manufacturers, subjects of the Queen of Great Britain, residing at Birmingham, England, have invented certain new and useful Improvements in Alarm Locks and Latches, (for which we have obtained Letters Patent of Great Britaimdated May 27, 1886, and numbered 7,099 and we do hereby declare the following to be a full, clear, and exact description of the invention, reference being had to the accompanying drawings, which form part of this specification.

This invention has for its object the ringing of a bell, or the creating of an alarm, on a person entering or leaving a room by the door. The act of turning a knob or handle for the withdrawal of the latch-bolt of a lock or latch gives an alarm and indicates the exit or entrance of a person.

Figure 1 represents .in front elevation an alarm or ringing lock constructed according to our invention. Fig. 2 shows a like view as Fig. l, but with the alarm or ringing mechanism thrown out of act-ion by the lowering of one end of the latch-bolt which works the ringing mechanism. Fig. 3 shows a vertical section of the said lock, and Fig. el shows the pallet of the verge and a portion of the facewheel upon a larger scale, while Fig. 5 represents our improvement applied to a latch.

Thus in Fig. 1 the actof turning the handle or knob of a door, or the act of pressing back the latch-bolt, raises an alarm by the ringing of the bell; and should a person clandestinely or otherwise open a door by the knob or by the pushing back of the latch, the act is at once detected. The throwing-out-of-gear arrangement is to prevent ringing when no alarm is wantedthat is, at ordinary times.

The same letters of reference indicate corresponding parts in the several figures of the draw'in a is an ordinary lock-casing provided with the usual lock-bolt, b and latch-bolt c, which move in a horizontal plane. The latch-bolt c is suspended at its back end bya pivoted hanging arm, (7, upon which a latch-follower, 6, acts and presses on the same, being partially rotated on the turning of aknob secured upon a spindle, 9 passing through the hushed eye of the said follower.

f is an ordinary flat spring for the bringing back of the parts to their normal positions.

g is a face-wheel with a double row of reversed Vshaped teeth, which gives a rapid intermittent motion to the pallet 71 of a verge, h, on the said face-wheel being rotated, and it is through the verge ii that the hammer 'i is operated and made to strike rapidly the lip of a bell,

Rotary motion is imparted to the facewheel, as aforesaid, by a pinion, k, on its axis 9 gearing with the teeth of a rack, 0 011 the upper edge of the latch-bolt 0, so that on the latch-bolt being worked a very rapid reciprocation is given to the hammer by the double row of teeth of the said face-wheel acting alternately upon the pallet of the verge, thus pushing the said pallet aside or from tooth to tooth and so giving the necessary oscillatory motion. v

The face-wheel g remains stationary when its axis and ratchet-wheel are rotated in a backward direction, but turns with the axis and ratchet-wheel when rotated in a forward direction (as indicated by the arrow) by the pawl Z engaging with the teeth of the said ratchet-Wheel, like that of an ordinary chrononietric instrument. The pawl is kept up to its work by a spring, Z

The ringing mechanism is thrown out of gearwhen no alarm or surprise is required by a slide, 0, with a knob, 0 passing through a slot, (11in the lower under side of the lockcase. The fore part of the slide has a turned end, 0 which, when out of position, comes,

beyond a rise or swell, c on the under side of the latch-bolt c; and to admit of the end lowering of the said bolt, as represented in i, a long hole, 0, is made, wherein a stud, (1 ,011 the lower end of the hanging lever (1, takes.

Having thus described our invention, we claim as new and desire to secure by Letters Patent 1 1. In an alarm-lock, the combination, with a movable latch or bolt having teeth, a ratchet wheel and pinion engaging with said teeth, of an escapement and striker engaging with said wheel and a bell arranged in proximity to said striker, all substantially as described.

2. The combination, with a look or latch case, a, latch-bolt c, and knob spindle or follower 6 6 of bell-ringing mechanism consisting' of face-wheel g, with double row of reversed V-sln'iped teeth, verge 71, pallet 71*, hammer i, bell j, pinion 7,1 and its axis rntchet'\\'hee1 m, reek-teeth. 0n latch-bolt, and paw], and spring I 1 substantially as (leseribed and set forth.

3). In an alarm-lock, the emnbiimtii'ln, with a toothed lnteh 0r belt and {L bell of a striker, :Ln esenpement operz'itin g the same, an escapement1-wheeha pin ion on the shaft: of said wheel, and a (log or pawl-anil-retellet conneetion between said pinion and esezrpeinent-wheel, whereby the latter will be turned only by the movement in one (lireetion 01 said lzitelnsnly Stnntiully 21s tltSLl'llJetl.

-l-. In an zilnriwloek, the e01iibil'in-tioil, with the longitntlimilly-movable toothed bolt? 0, having slot (1 and rise 1-, ol? the pinion the alarm mechanism eonneeted therewith, and the sliding P121110 0, mlnpteil to engage with rise snbstzmtinlly ns (leseribei'l, so as to bring said pinion into engagement with the bolt; e, as set forth.

Signed this 20th (lay of June, lHhT.

JO EL ADIBIT'RY. JOSEPH GEORGE ROLLASON.

Witnesses:

Il exjrr Snnnmrrtr, l IENRY S. \Ymon'r,

Bel/1 ofBirmingham. 

